zsh:keys: Reuse the default fallback for FZF_ALT_C

Instead of implementing it twice, simulate a shell without ripgrep to
get the fallback of FZF_DEFAULT_COMMAND and modify it for use with
directories.

.config/zsh/.zprofile

@@ -95,6 +95,7 @@ if (( $+commands[rg] )); then
 	FZF_DEFAULT_COMMAND="rg -L --hidden --files -g '!.git'"
 else
 	# Fallback to hardcoding the most important paths to prune
+	# NOTE: This version is used in keys.zsh for the ALT_C widget
 	FZF_DEFAULT_COMMAND="find -L . \("
 		FZF_DEFAULT_COMMAND+=" -name '.git' -o"
 		FZF_DEFAULT_COMMAND+=" -name '__pycache__' -o"